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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 17 |
| 3 | 65 |
| 4 | 229 |
| 5 | 1217 |
| 6 | 5781 |
| 7 | 24257 |
| 8 | 100889 |
| 9 | 410657 |
| 10 | 1659457 |
| 11 | 6661429 |
| 12 | 26698273 |
| 13 | 106920229 |
| 14 | 427887877 |
| 15 | 1712073953 |
[1,5,17,65,229,1217,5781,24257,100889,410657, 1659457,6661429,26698273,106920229,427887877, 1712073953] |